Single page WP site (Oshine theme, Tatsu editor) Main menu # anchor links

Hi,
My WP Oshine theme, Tatsu made, single-page site main menu only works when logged in. The menu uses # anchors, and the ID is defined in section on the page made through Tatsu. When logged in, it jumps to the correct section, when not it does nothing.

Can anyone point me in the right direction of what may be breaking it, pls? I’ve turned off plug ins (all), I’ve turned off elements in Tatsu, … but nothing seems to work?!

Thanks,

Matt

The page I need help with: [log in to see the link]